I have a dpt over the barrel model on a 6.5-284
I have a Atec hertz on a 6.5x47
I have a T8 on a 270
I would prefer DPT on all of them because it's the smallest and lightest. I cannot tell the difference between any of them in terms of noise reduction nor felt recoil but it may not really be fair to judge this because of the difference in cartridges.
The other mod I would look into if I was looking for one would be Freyr-Devik